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very good these days,
and there are hearing aids
that can be used on a frequency
specific manner, that is
don't amplify anything
at low frequencies and amplify
exactly the amount of loss
at high frequencies.
So at first, it sounds
like a good idea,
but we'll get into the reason
that that doesn't always
work later on.
So that simple solution,
just install a hearing aid--
a hearing aid, which everybody
has seen one probably in older
people-- is simply an amplifier.
It has a microphone.
It picks up sound.
It boosts the sound
in whatever frequency
ranges the audiologist programs.
And then it has a little
speaker and it speaks or plays
the boosted sound into the
ear canal of the person.
So it's just an amplifier.
So you can have hearing
aids that work very well
and their frequency tailored.
And they especially
work very well
for the type of
hearing loss that's
called the conductive
hearing loss because, simply,
the problem is getting the
sound into the inner ear,
and amplifying the
sound, in a person
with a conductive hearing
loss, works very well.
It doesn't work so well
in sensorineural hearing
loss for reasons we'll
get into in a little bit.
Now how do these
hearing losses happen?
There are a variety of causes
that can damage your hearing.
We all have fun with sounds,
and we tend to have a lot of fun
when the sounds
are very intense.
And these are so-- this is an
old transparency obviously.
But this is a graph of
sound pressure level here.
Remember the thresholds of
hearing are way down here.
And these are some
example sounds
that have very high